callFromOldNames

Calls each supplied name individually to Mojang's servers, treating them
as previously used names which henceforth were changed. This method is
much slower than the other call methods, and should only be used
if there is a need to retrieve names which are now changed

A Map of supplied names to relevant UserInfo.
Note that this map will contain the supplied names even if they
are invalid or not actual usernames (in which case, they will
be mapped to null). Note names that have never been
changed before will be mapped as invalid per this method